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That's all folks

Functional Programming allows us to design program with a mathematical approach.
Immutability and function composition are the two pillars of this approach, and are really adapted to scalabilty.
We went through the main functional aspects of Scala, but there still is so much to discover.

To Go Further

If you are interested by Javascript, you can have a look to Eric Eliott's blog and his series Composing software

If you want to dive deeper into Scala, you should know that Scala's real strengths are frameworks. Have a look at Akka, Play or Spark.

Corrections

You can find the corrections of this hands-on on my github: answer branch